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The internal commands are those which are automatically loaded in the memory of your personal computer when DOS is loaded. Then those commands can be used without the need of any file or diskette. The internal commands are simple and are used for common jobs, such as copying, erasing and renaming file or changing the directory and changing the current date, time in your personal computer.

All internal commands are called memory resident commands.

All internal commands are part of Command.com

These are do not require any special files for being executing and are brought into the memory as soon as the computer is switched on.

List of Internal Commands :

DIR

CD

COPY

MD

DEL

CLS

TYPE

DATE

TIME

PATH

REN

RD1

BREAK

CALL

ECHO

EXIT

GOTO

IF

PAUSE

PROMPT

REM

SET

SHIFT

VER

VERIFY

VOL

EXTERNAL COMMANDS:

The external commands are used for relative complex jobs such as copying the entire diskette, comparing or joining files, sorting text and formatting a diskette. For using external commands, you need to use corresponding file available in the DOS diskettes or the hard disk.

All External commands are disk resident commands. These commands will be loaded at the use of request.

Any command which contains COM, EXE, BAT may called as external commands.